Gut feeling that my boyfriend is doing something behind my back?

Anonymous
Why do I feel like my boyfriend is doing something behind my back with another girl, whether it's talking over text or just seeing a girl. He's told me he's never cheated in his life and neither have I honestly. I believed him cause the way he talked about his past relationships of how they treated him badly and he's always wanted a girlfriend the right one. And hard to believe but he was a virgin until he met me. I wasn't a virgin before I met him. I had so much trust and everything with him cause the way he would treat me texting/calling/face timing me everyday and we're on our 5th month and he still does it. But when there's little change it makes me think I don't know if that's just me but I remember one thing that wasn't true... he told me that he doesn't have any of his exs as a friend on social media until he told me about an ex and said her name then I see her on his social media as a friend, kinda weird. He still treats me the same and been seeing his family a lot. Am I just overthinking? Whenever I say something that upsets me or don't like something he listens and does whatever to make me happy but sometimes I feel like he holds back a little.
Gut feeling that my boyfriend is doing something behind my back?
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